Participants: Yves Coppens, Professor Emeritus at the Collège de France; John Mather, Nobel Prize Winner for Physics in 2006, Senior Astrophysicist at the Observational Cosmology Laboratory of NASA’s Goddard Space Flight Center; Charles Townes, Nobel Prize Winner for Physics in 1964, Professor at the Space Sciences Laboratory of the University of California, Berkeley. Introduced by: Marco Bersanelli, Professor of Astrophysics at the University of Milan.